세라믹스의 균열성장지수와 Weibull계수를 결정하는 방법에 대한 연구 = A Study on the Method to Determine Crack Growth Exponent and Weibull Modulus in Ceramics

다국어 초록 (Multilingual Abstract)

The method to determine crack growth exponent and Weibull modulus was studied in alumina ceramics. The values of the crack growth exponent n for static fatigue and cyclic fatigue were determined by measuring the fatigue lifetime as 39.73±10.62 and 21.60±2.46, respectively. The crack growth exponent n and the Weibull modulus m can be directly determined by reading the slopes of the SPT(Strength-Probability-Time) and TPS(Time-Praobability-Stength) diagrams, which are nm/(n-2) and m/(n-2), respectively. The slopes of SPT and TPS diagrams for the static fatigue test are 24.09±0.68 and 0.61±0.02, respectively, and the resulting n and m are 39.49 and 22.87, respectively. For the cyclic fatigue test, the slopes of SPT and TPS diagrams are 16.97±0.50 and 0.79±0.02, respectively, and the resulting n and m are 21.48 and 15.39, respectively. The values of the crack growth exponent and Weibull modulus obtained in this method show small deviation and large reliability than the values obtained by other methods.